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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="hardware_destructive_interference_size.html" title="cpp/thread/hardware destructive interference size"><span class="t-lines"><span>hardware_destructive_interference_size</span><span>hardware_constructive_interference_size</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span><span><span class="t-mark-rev t-since-cxx17">(C++17)</span></span></span></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5"> <code>this_thread</code> 命名空间</td></tr>
<tr class="t-nv-col-table"><td><div><table class="t-nv-begin" cellpadding="0" style="">
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<tr class="t-nv-h1"><td colspan="5"> 互斥</td></tr>
<tr class="t-nv-col-table"><td><div><table class="t-nv-begin" cellpadding="0" style="">
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<tr class="t-nv-h2"><td colspan="5"> 通用锁管理</td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="lock_tag.html" title="cpp/thread/lock tag"><span class="t-lines"><span>defer_lock</span><span>try_to_lock</span><span>adopt_lock</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
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<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="call_once.html" title="cpp/thread/call once"><span class="t-lines"><span>call_once</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
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<tr class="t-nv-h1"><td colspan="5"> 条件变量</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><strong class="selflink"><span class="t-lines"><span>condition_variable</span></span></strong></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="condition_variable_any.html" title="cpp/thread/condition variable any"><span class="t-lines"><span>condition_variable_any</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="notify_all_at_thread_exit.html" title="cpp/thread/notify all at thread exit"><span class="t-lines"><span>notify_all_at_thread_exit</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="cv_status.html" title="cpp/thread/cv status"><span class="t-lines"><span>cv_status</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> 信号量</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="counting_semaphore.html" title="cpp/thread/counting semaphore"><span class="t-lines"><span>counting_semaphore</span><span>binary_semaphore</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> 闩与屏障</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="latch.html" title="cpp/thread/latch"><span class="t-lines"><span>latch</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="barrier.html" title="cpp/thread/barrier"><span class="t-lines"><span>barrier</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx20">(C++20)</span></span></span></div></div></td></tr>
<tr class="t-nv-h1"><td colspan="5"> future</td></tr>
<tr class="t-nv-col-table"><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="promise.html" title="cpp/thread/promise"><span class="t-lines"><span>promise</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="future.html" title="cpp/thread/future"><span class="t-lines"><span>future</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="shared_future.html" title="cpp/thread/shared future"><span class="t-lines"><span>shared_future</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="packaged_task.html" title="cpp/thread/packaged task"><span class="t-lines"><span>packaged_task</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="async.html" title="cpp/thread/async"><span class="t-lines"><span>async</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
</table></div></td><td><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="launch.html" title="cpp/thread/launch"><span class="t-lines"><span>launch</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="future_status.html" title="cpp/thread/future status"><span class="t-lines"><span>future_status</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="future_error.html" title="cpp/thread/future error"><span class="t-lines"><span>future_error</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="future/future_category.html" title="cpp/thread/future category"><span class="t-lines"><span>future_category</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="future_errc.html" title="cpp/thread/future errc"><span class="t-lines"><span>future_errc</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div></div></td></tr>
</table></div></td></tr>
</table></div><div></div></div></div></div><div class="t-navbar-sep"> </div><div class="t-navbar-head"><strong class="selflink"><tt>std::condition_variable</tt></strong><div class="t-navbar-menu"><div><div><table class="t-nv-begin" cellpadding="0" style="">
<tr class="t-nv-h1"><td colspan="5">成员函数</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="condition_variable/condition_variable.html" title="cpp/thread/condition variable/condition variable"><span class="t-lines"><span>condition_variable::condition_variable</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="condition_variable/~condition_variable.html" title="cpp/thread/condition variable/~condition variable"><span class="t-lines"><span>condition_variable::~condition_variable</span></span></a></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5">通知</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="condition_variable/notify_one.html" title="cpp/thread/condition variable/notify one"><span class="t-lines"><span>condition_variable::notify_one</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="condition_variable/notify_all.html" title="cpp/thread/condition variable/notify all"><span class="t-lines"><span>condition_variable::notify_all</span></span></a></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5">等待</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="condition_variable/wait.html" title="cpp/thread/condition variable/wait"><span class="t-lines"><span>condition_variable::wait</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="condition_variable/wait_for.html" title="cpp/thread/condition variable/wait for"><span class="t-lines"><span>condition_variable::wait_for</span></span></a></div></div></td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="condition_variable/wait_until.html" title="cpp/thread/condition variable/wait until"><span class="t-lines"><span>condition_variable::wait_until</span></span></a></div></div></td></tr>
<tr class="t-nv-h2"><td colspan="5">原生句柄</td></tr>
<tr class="t-nv"><td colspan="5"><div class="t-nv-ln-table"><div><a href="condition_variable/native_handle.html" title="cpp/thread/condition variable/native handle"><span class="t-lines"><span>condition_variable::native handle</span></span></a></div></div></td></tr>
</table></div><div></div></div></div></div><div class="t-navbar-sep"> </div></div>
<table class="t-dcl-begin"><tbody>
<tr class="t-dsc-header">
<td> <div>定义于头文件 <code><a href="../header/condition_variable.html" title="cpp/header/condition variable">&lt;condition_variable&gt;</a></code>
 </div></td>
<td></td>
<td></td>
</tr>
<tr class="t-dcl t-since-cxx11">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">class</span> condition_variable<span class="sy4">;</span></span></div></td>
<td class="t-dcl-nopad">  </td>
<td> <span class="t-mark-rev t-since-cxx11">(C++11 起)</span> </td>
</tr>
<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
</tbody></table>
<p><code>condition_variable</code> 类是同步原语，能用于阻塞一个线程，或同时阻塞多个线程，直至另一线程修改共享变量（<i>条件</i>）并通知 <code>condition_variable</code> 。
</p><p>有意修改变量的线程必须
</p>
<ol><li> 获得 <code>std::mutex</code> （典型地通过 <span class="t-lc"><a href="lock_guard.html" title="cpp/thread/lock guard">std::lock_guard</a></span> ）
</li><li> 在保有锁时进行修改
</li><li> 在 <code>std::condition_variable</code> 上执行 <span class="t-lc"><a href="condition_variable/notify_one.html" title="cpp/thread/condition variable/notify one">notify_one</a></span> 或 <span class="t-lc"><a href="condition_variable/notify_all.html" title="cpp/thread/condition variable/notify all">notify_all</a></span> （不需要为通知保有锁）
</li></ol>
<p>即使共享变量是原子的，也必须在互斥下修改它，以正确地发布修改到等待的线程。
</p><p>任何有意在 <code>std::condition_variable</code> 上等待的线程必须
</p>
<ol><li> 获得 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="unique_lock.html"><span class="kw2167">std::<span class="me2">unique_lock</span></span></a><span class="sy1">&lt;</span><a href="mutex.html"><span class="kw2154">std::<span class="me2">mutex</span></span></a><span class="sy1">&gt;</span></span></span> ，在与用于保护共享变量者相同的互斥上
</li><li> 执行 <span class="t-lc"><a href="condition_variable/wait.html" title="cpp/thread/condition variable/wait">wait</a></span> 、 <span class="t-lc"><a href="condition_variable/wait_for.html" title="cpp/thread/condition variable/wait for">wait_for</a></span> 或 <span class="t-lc"><a href="condition_variable/wait_until.html" title="cpp/thread/condition variable/wait until">wait_until</a></span> ，等待操作自动释放互斥，并悬挂线程的执行。
</li><li> condition_variable 被通知时，时限消失或<a href="https://en.wikipedia.org/wiki/Spurious_wakeup" class="extiw" title="enwiki:Spurious wakeup">虚假唤醒</a>发生，线程被唤醒，且自动重获得互斥。之后线程应检查条件，若唤醒是虚假的，则继续等待。
</li></ol>
<p><code>std::condition_variable</code> 只可与 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="unique_lock.html"><span class="kw2167">std::<span class="me2">unique_lock</span></span></a><span class="sy1">&lt;</span><a href="mutex.html"><span class="kw2154">std::<span class="me2">mutex</span></span></a><span class="sy1">&gt;</span></span></span> 一同使用；此限制在一些平台上允许最大效率。 <span class="t-lc"><a href="condition_variable_any.html" title="cpp/thread/condition variable any">std::condition_variable_any</a></span> 提供可与任何<a href="../named_req/BasicLockable.html" title="cpp/named req/BasicLockable"><i>基本可锁定</i> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(BasicLockable)</span> </a>对象，例如 <span class="t-lc"><a href="shared_lock.html" title="cpp/thread/shared lock">std::shared_lock</a></span> 一同使用的条件变量。
</p><p>condition_variable 容许 <span class="t-lc"><a href="condition_variable/wait.html" title="cpp/thread/condition variable/wait">wait</a></span> 、 <span class="t-lc"><a href="condition_variable/wait_for.html" title="cpp/thread/condition variable/wait for">wait_for</a></span> 、 <span class="t-lc"><a href="condition_variable/wait_until.html" title="cpp/thread/condition variable/wait until">wait_until</a></span> 、 <span class="t-lc"><a href="condition_variable/notify_one.html" title="cpp/thread/condition variable/notify one">notify_one</a></span> 及 <span class="t-lc"><a href="condition_variable/notify_all.html" title="cpp/thread/condition variable/notify all">notify_all</a></span> 成员函数的同时调用。
</p><p>类 <code>std::condition_variable</code> 是<a href="../named_req/StandardLayoutType.html" title="cpp/named req/StandardLayoutType"><i>标准布局类型</i> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(StandardLayoutType)</span> </a>。它不<a href="../named_req/CopyConstructible.html" title="cpp/named req/CopyConstructible"><i>可复制构造</i> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(CopyConstructible)</span> </a>、<a href="../named_req/MoveConstructible.html" title="cpp/named req/MoveConstructible"><i>可移动构造</i> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(MoveConstructible)</span> </a>、<a href="../named_req/CopyAssignable.html" title="cpp/named req/CopyAssignable"><i>可复制赋值</i> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(CopyAssignable)</span> </a>或<a href="../named_req/MoveAssignable.html" title="cpp/named req/MoveAssignable"><i>可移动赋值</i> <span style="font-family: Georgia, 'DejaVu Serif', serif; font-style:italic">(MoveAssignable)</span> </a>。
</p>
<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E7.B1.BB.E5.9E.8B">成员类型</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc-sep">
<td colspan="2">  
</td></tr>
<tr class="t-dsc-hitem">
<td> 成员类型
</td>
<td> 定义
</td></tr>


<tr class="t-dsc">
<td>  <code>native_handle_type</code>
</td>
<td>  <i>实现定义</i>
</td></tr>
</table>
<h3><span class="mw-headline" id=".E6.88.90.E5.91.98.E5.87.BD.E6.95.B0">成员函数</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div t-dsc-member-nobold-div"><div><a href="condition_variable/condition_variable.html" title="cpp/thread/condition variable/condition variable"> <span class="t-lines"><span>(构造函数)</span></span></a></div></div>
</td>
<td>  构造对象 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div t-dsc-member-nobold-div"><div><a href="condition_variable/~condition_variable.html" title="cpp/thread/condition variable/~condition variable"> <span class="t-lines"><span>(析构函数)</span></span></a></div></div>
</td>
<td>  析构对象 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><span class="t-lines"><span>operator=</span></span></div><div><span class="t-lines"><span><span class="t-cmark">[被删除]</span></span></span></div></div>
</td>
<td>  不可复制赋值 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>


<tr>
<td colspan="2"> <h5> <span class="mw-headline" id=".E9.80.9A.E7.9F.A5"> 通知 </span></h5>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="condition_variable/notify_one.html" title="cpp/thread/condition variable/notify one"> <span class="t-lines"><span>notify_one</span></span></a></div></div>
</td>
<td>  通知一个等待的线程 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="condition_variable/notify_all.html" title="cpp/thread/condition variable/notify all"> <span class="t-lines"><span>notify_all</span></span></a></div></div>
</td>
<td>  通知所有等待的线程 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>


<tr>
<td colspan="2"> <h5> <span class="mw-headline" id=".E7.AD.89.E5.BE.85"> 等待 </span></h5>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="condition_variable/wait.html" title="cpp/thread/condition variable/wait"> <span class="t-lines"><span>wait</span></span></a></div></div>
</td>
<td>  阻塞当前线程，直到条件变量被唤醒 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="condition_variable/wait_for.html" title="cpp/thread/condition variable/wait for"> <span class="t-lines"><span>wait_for</span></span></a></div></div>
</td>
<td>  阻塞当前线程，直到条件变量被唤醒，或到指定时限时长后 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="condition_variable/wait_until.html" title="cpp/thread/condition variable/wait until"> <span class="t-lines"><span>wait_until</span></span></a></div></div>
</td>
<td>   阻塞当前线程，直到条件变量被唤醒，或直到抵达指定时间点  <br> <span class="t-mark">(公开成员函数)</span> </td></tr>


<tr>
<td colspan="2"> <h5> <span class="mw-headline" id=".E5.8E.9F.E7.94.9F.E5.8F.A5.E6.9F.84"> 原生句柄 </span></h5>
</td></tr>

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="condition_variable/native_handle.html" title="cpp/thread/condition variable/native handle"> <span class="t-lines"><span>native_handle</span></span></a></div></div>
</td>
<td>  返回原生句柄 <br> <span class="t-mark">(公开成员函数)</span> </td></tr>
</table>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
<div class="t-example"><p>与 <span class="t-lc"><a href="mutex.html" title="cpp/thread/mutex">std::mutex</a></span> 组合使用 <code>condition_variable</code> ，以促进线程间交流。</p><div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">运行此代码</div></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;string&gt;</span>
<span class="co2">#include &lt;thread&gt;</span>
<span class="co2">#include &lt;mutex&gt;</span>
<span class="co2">#include &lt;condition_variable&gt;</span>
 
<a href="mutex.html"><span class="kw2154">std::<span class="me2">mutex</span></span></a> m<span class="sy4">;</span>
std<span class="sy4">::</span><span class="me2">condition_variable</span> cv<span class="sy4">;</span>
<a href="../string/basic_string.html"><span class="kw1230">std::<span class="me2">string</span></span></a> data<span class="sy4">;</span>
<span class="kw4">bool</span> ready <span class="sy1">=</span> <span class="kw2">false</span><span class="sy4">;</span>
<span class="kw4">bool</span> processed <span class="sy1">=</span> <span class="kw2">false</span><span class="sy4">;</span>
 
<span class="kw4">void</span> worker_thread<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
    <span class="co1">// 等待直至 main() 发送数据</span>
    <a href="unique_lock.html"><span class="kw2167">std::<span class="me2">unique_lock</span></span></a><span class="sy1">&lt;</span><a href="mutex.html"><span class="kw2154">std::<span class="me2">mutex</span></span></a><span class="sy1">&gt;</span> lk<span class="br0">(</span>m<span class="br0">)</span><span class="sy4">;</span>
    cv.<span class="me1">wait</span><span class="br0">(</span>lk, <span class="br0">[</span><span class="br0">]</span><span class="br0">{</span><span class="kw1">return</span> ready<span class="sy4">;</span><span class="br0">}</span><span class="br0">)</span><span class="sy4">;</span>
 
    <span class="co1">// 等待后，我们占有锁。</span>
    <a href="../io/cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">"Worker thread is processing data<span class="es1">\n</span>"</span><span class="sy4">;</span>
    data <span class="sy2">+</span><span class="sy1">=</span> <span class="st0">" after processing"</span><span class="sy4">;</span>
 
    <span class="co1">// 发送数据回 main()</span>
    processed <span class="sy1">=</span> <span class="kw2">true</span><span class="sy4">;</span>
    <a href="../io/cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">"Worker thread signals data processing completed<span class="es1">\n</span>"</span><span class="sy4">;</span>
 
    <span class="co1">// 通知前完成手动解锁，以避免等待线程才被唤醒就阻塞（细节见 notify_one ）</span>
    lk.<span class="me1">unlock</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
    cv.<span class="me1">notify_one</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span>
 
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
    <a href="thread.html"><span class="kw2146">std::<span class="me2">thread</span></span></a> worker<span class="br0">(</span>worker_thread<span class="br0">)</span><span class="sy4">;</span>
 
    data <span class="sy1">=</span> <span class="st0">"Example data"</span><span class="sy4">;</span>
    <span class="co1">// 发送数据到 worker 线程</span>
    <span class="br0">{</span>
        <a href="lock_guard.html"><span class="kw2166">std::<span class="me2">lock_guard</span></span></a><span class="sy1">&lt;</span><a href="mutex.html"><span class="kw2154">std::<span class="me2">mutex</span></span></a><span class="sy1">&gt;</span> lk<span class="br0">(</span>m<span class="br0">)</span><span class="sy4">;</span>
        ready <span class="sy1">=</span> <span class="kw2">true</span><span class="sy4">;</span>
        <a href="../io/cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">"main() signals data ready for processing<span class="es1">\n</span>"</span><span class="sy4">;</span>
    <span class="br0">}</span>
    cv.<span class="me1">notify_one</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
 
    <span class="co1">// 等候 worker</span>
    <span class="br0">{</span>
        <a href="unique_lock.html"><span class="kw2167">std::<span class="me2">unique_lock</span></span></a><span class="sy1">&lt;</span><a href="mutex.html"><span class="kw2154">std::<span class="me2">mutex</span></span></a><span class="sy1">&gt;</span> lk<span class="br0">(</span>m<span class="br0">)</span><span class="sy4">;</span>
        cv.<span class="me1">wait</span><span class="br0">(</span>lk, <span class="br0">[</span><span class="br0">]</span><span class="br0">{</span><span class="kw1">return</span> processed<span class="sy4">;</span><span class="br0">}</span><span class="br0">)</span><span class="sy4">;</span>
    <span class="br0">}</span>
    <a href="../io/cout.html"><span class="kw1758">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">"Back in main(), data = "</span> <span class="sy1">&lt;&lt;</span> data <span class="sy1">&lt;&lt;</span> <span class="st0">'<span class="es1">\n</span>'</span><span class="sy4">;</span>
 
    worker.<span class="me1">join</span><span class="br0">(</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div></div>
<p>输出：
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">main() signals data ready for processing
Worker thread is processing data
Worker thread signals data processing completed
Back in main(), data = Example data after processing</pre></div></div> 
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